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v3.21.2

Fair Value Of Financial Instruments (Schedule Of Key Valuation Inputs Used To Measure Fair Value Of Investment In Cell C) (Details) - Cell C [Member] R in Billions, $ in Billions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 ZAR (R) | Jun. 30, 2021 ZAR (R)
Net adjusted external debt | $ 0.8 | $ 0.8 | R 11.5 | R 11.2
Lease liabilities included in net adjusted external debt |  |  | R 0.0 | R 0.0
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member] |  |  |  |
Investment fair value measurement inputs | 18.00% | 18.00% |  |
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member] |  |  |  |
Investment fair value measurement inputs | 24.00% | 24.00% |  |
Long Term Growth Rate [Member] |  |  |  |
Investment fair value measurement inputs | 3.00% | 3.00% |  |
Marketability Discount [Member] |  |  |  |
Investment fair value measurement inputs | 10.00% |  |  |
Minority Discount [Member] |  |  |  |
Investment fair value measurement inputs | 15.00% |  |  |

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